"During the Six Day War" joke

During the Six Day War, this division of Arabs is making its way across
the burning desert sands towards Israel, when the Arab commander, bouncing
along in his jeep, spots an aged Israeli on top a distant sand dune. The
commander drops his binoculars and shouts orders to a foot soldier to run
up ahead and kill the infidel Israeli. The soldier sprints ahead of the
advancing troops, and soon disappears over the sand dune. The general
stops the troops and waits to see what happens.
Nothing happens. The commander sends a whole platoon of soldiers to
investigate. All twelve Arabs disappear over the sand dune, never to be
seen again. The now-slightly-anxious commander dispatches 3 tanks to find
out just what in the heck is going on, and they disappear over the dune,
too. Sweat pours down the commander's forehead as he orders his entire
division to overrun the solitary Israeli behind the sand dune.
But just then, the first soldier reappears on the distant sand dune and
cups his hands to his lips. "Go back!" he shouts. "Go back! It's
hopeless-- there's TWO of them!"